Having all your features working is essential with your phone Garoldine. The wifi is a pretty important element. Let’s get this working for you. What happens when you try to connect? Are you getting any errors, not able to turn on, shows connected but not loading, etc? Are you able to connect to other wifi networks or are all not connecting?
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Try resetting network connections, which is a step Apple would have you take. Just a heads up it will delete your saved Wi-Fi networks.
Settings > General > Reset > Reset Network Settings
The only other thing I can suggest is to backup your device, restore to default and see if the problem exists before you restore your device from backup. This is also a step Apple will ask that you try.